Add AP214/AP242 merged schema

This schema was created by STEPTools. According to the comment, it was

```
(* Constructed by merging:
 *  - AP242 (wg12n8324_ap242dis.exp)
 *  - AP214 (wg3n2628_ap214e3.exp)
 *  - AP203e2 (wg3n2635_ap203e2.exp)
 *  - Deprecated AP203e1 (ap203e1_types.exp)
 *  - AP242 DIS Fixes (ap242_fixes.exp)
 *)
```

I made some more modifications to eliminate errors reported by fedex_plus. This was done by **commenting out(!)** a where rule and parts of several functions, and adding an additional supertype to one entity. I added a comment to the file noting these changes.

@starseeker here's your schema :)